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Gas and Plumbing Requirements
Chapter 1
Laboratory Preparation
Hydrogen
For carrier or detector fuel gas: 99.995%1 high purity, with less than 1.0 ppm of
total hydrocarbons after purification. One full-size tank that has an outlet pressure
of 400–700 kPa (60–100 psi). Use a regulator with a CGA 350 connection or
equivalent. Use water, oxygen and hydrocarbon traps.
Air
For detector fuel gas: 99.995%1 high purity. Use a regulator with a CGA 0590
connection or equivalent. Air compressors are not acceptable because they do not
meet pressure, water, and hydrocarbon requirements.
Nitrogen
For carrier or make-up gas: 99.995% high purity, with less than 1.0 ppm of total
hydrocarbons after purification. Use a regulator with a CGA 0580 connection or
equivalent.
Argon/5% Methane
For ECD make-up gas: 99.995%1 high purity. Use a regulator with a CGA 350
connection or equivalent.
Servo Air
For valve actuation and secondary cooling: Commercial grade or filtered air
compressor. Large volume delivery at 400–500 kPa (60–80 psi), free of particles,
oils, and water.
Gas Regulators and Fittings
Gas tanks may be equipped with either single- or dual-stage regulators that
contain stainless steel diaphragms. The regulator output pressure should be
adjustable from 300 to 1000 kPa (45–145 psi). Each regulator should be equipped
with a 1/8-in. Swagelok compression fitting, or equivalent. Figure 1-3 shows a
dual-stage gas regulator with 1/8-in. fittings.
Site Preparation and Installation Manual
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